How many kinds of network, 2, 3, 4, 1, How many kinds of generation, 5, 6, 3, 4, how many kinds of modem, 1, 2, 3, 4, how many kinds of computer, 1, 2, 3, 4, how many kinds of memory, 3, 2, 1, 4, how many buttons in title bar, 1, 2, 3, 4, How many kinds of operating system, 1, 2, 3, 4, how many kinds of key, 2, 3, 5, 7, How many kinds of primary memory, 2, 3, 10, 8, how many worksheet in a workbook, 3, 4, 5, 6.

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